Episode Ratings Grid

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Great

Episode Power Rankings

The peaks and the valleys. Find the essential episodes — and the ones to skip.

#1
S1E2 8.7
The Deep

A place of mountain ranges, perpetual night, pressures extremes and cold... and the weirdest life forms on our planet. Dive into the depths of the ocean, an eerie world where predators with teeth so large they can't even close their mouths, chase bio-luminescent creatures of the deep. Discover the spectacular smoking chimneys of the hydrothermal vents. Go deeper down than you have ever been...

#2
S1E1 8.3
Ocean World

Experience the power of the blue whale - the largest mammal ever to grace our planet. Learn how the sun and moon help control and tame the ocean. Travel far and wide - from the Eastern Pacific to Alaska, from the Bering Sea to the shores of Southern California - and begin to understand the complexity and power of our oceans.

#3
S1E4 8.3
Frozen Seas

An environment where only the toughest survive, the Arctic and Antarctic are unrelenting habitats. Only in spring does life begin again. Plankton blooms and feeds fast hordes of migrating fish, walruses rake the seabed for clams, and minke and humpback whales gorge themselves on gigantic swarms of krill. But it is a brief spring feast - the ice soon returns and pushes life back into the ocean.

#4 Coasts S1E8 8.2
#5 Coral Seas S1E6 8.1
#6 Tidal Seas S1E7 8.1
#7 Open Ocean S1E3 8.0
#8 Seasonal Seas S1E5 8.0

Lowlights

#8 S1E5 Seasonal Seas 8.0

As the days grow longer, billions of microscopic plankton bloom under the blazing sun. Here in the temperate seas, three-ton basking sharks graze among forests of giant kelp - the fastest growing plant in the world. The forests harbor thousands of other animals, including sea otters, brilliantly colored anemones, squid, and exquisite leafy dragons. But as the year wears on, storms rage in the icy sea... a desperate challenge for the animals that remain.

#7 Open Ocean S1E3 8.0
#6 Tidal Seas S1E7 8.1
#5 Coral Seas S1E6 8.1
#4 Coasts S1E8 8.2

The Quality Arc

Each point is an episode, plotted in order. Colored bands mark season boundaries. Look for the rise, the plateau, or the decline.

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Episode Engagement

High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

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